manifest: Untag systemd
manifest: Untag systemd

The hangs were actually swapoff not being functional; we can resume
tracking git master now.

GNOME/gnome-ostree,vrutkovs/vrutkovs.github.io,chergert/gnome-continuous,chergert/gnome-continuous,vrutkovs/vrutkovs.github.io,GNOME/gnome-ostree,chergert/gnome-continuous,GNOME/gnome-ostree,vrutkovs/vrutkovs.github.io